A discrete element method(DEM)-computa-tional fluid dynamics(CFD)two-way coupling method was employed to simulate the hydrodynamics in a two-dimensional spouted bed with draft plates.The motion of particles was modele...A discrete element method(DEM)-computa-tional fluid dynamics(CFD)two-way coupling method was employed to simulate the hydrodynamics in a two-dimensional spouted bed with draft plates.The motion of particles was modeled by the DEM and the gas flow was modeled by the Navier-Stokes equation.The interactions between gas and particles were considered using a two-way coupling method.The motion of particles in the spouted bed with complex geometry was solved by com-bining DEM and boundary element method(BEM).The minimal spouted velocity was obtained by the BEM-DEM-CFD simulation and the variation of the flow pat-tern in the bed with different superficial gas velocity was studied.The relationship between the pressure drop of the spouted bed and the superficial gas velocity was achieved from the simulations.The radial profile of the averaged vertical velocities of particles and the profile of the aver-aged void fraction in the spout and the annulus were stat-istically analyzed.The flow characteristics of the gas-solid system in the two-dimensional spouted bed were clearly described by the simulation results.展开更多
基金This work was financially supported by the National Natural Science Foundation of China(Grant No.20306012)the China Postdoctoral Science Foundation(2005038061).
文摘A discrete element method(DEM)-computa-tional fluid dynamics(CFD)two-way coupling method was employed to simulate the hydrodynamics in a two-dimensional spouted bed with draft plates.The motion of particles was modeled by the DEM and the gas flow was modeled by the Navier-Stokes equation.The interactions between gas and particles were considered using a two-way coupling method.The motion of particles in the spouted bed with complex geometry was solved by com-bining DEM and boundary element method(BEM).The minimal spouted velocity was obtained by the BEM-DEM-CFD simulation and the variation of the flow pat-tern in the bed with different superficial gas velocity was studied.The relationship between the pressure drop of the spouted bed and the superficial gas velocity was achieved from the simulations.The radial profile of the averaged vertical velocities of particles and the profile of the aver-aged void fraction in the spout and the annulus were stat-istically analyzed.The flow characteristics of the gas-solid system in the two-dimensional spouted bed were clearly described by the simulation results.
